/ Dictionary / Index P protriptyline: Meaning and Definition of Find definitions for: pro•trip•ty•line Pronunciation: (prō-trip'tl-ēn", -in), [key] — n. Pharm. a white to yellow powder, CHN, used for the treatment of depression. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: protriptyline (Thesaurus) protractor protrude Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language